Real A32x MCDU EKCH-LKPR planning and calculation.

[SSO]

Hi,


I have a couple of questions as to how the MCDU calculates the following situation:
A flight into LKPR from the north with an ILS24 approach.
The flight is from eg. EKCH and via GOLOP1S STAR.


The STAR has no vertical constraints and ends with a manual heading of 062 - vectors for the ILS.


Questions regarding this arrival:
1- How does the MCDU calculate Top of Descent?
2- How does the MCDU calculate Remaining distance (and thereby fuel at Arrival)?


Thank you for enlightning me


/Stephen

[jeehell]

Hi

Manual legs are computed as if the ACFT flew from the initial point if that leg directly to the next "normal" waypoint.

Regards
JL

[SSO]

Thanks Jean Luc,

The "Flight plan discontinuity" AFTER the manual leg. Should that remain or be deleted for the manual leg to be flown?

/Stephen

[jeehell]

it cannot be deleted, it is part of the manual leg.

[SSO]

Ok - understood.
The whole background for my query is that both fuel at destination, time-to-go were be off, and no TOD was calculated by B35 inbound to Prague.
Distance-to-go seemed to be ok.

/Stephen

[jeehell]

That's all still part of VNAV, which as you know is still work in progress (for a long time...).

JL

[SSO]

Ok - just as long as it is related. Usually there is a ToD, just off